JPS6340671B2 - - Google Patents

Description

[Detailed description of the invention] 【Technical field】

The present invention relates to a heat curing furnace used in a continuous manufacturing process of laminates, and relates to a technique for eliminating the waving phenomenon on the surface of the laminate and improving the surface smoothness of the laminate.

[Background technology]

Conventionally, as shown in FIG. 2, a resin-impregnated base material 1 impregnated with a thermosetting uncured synthetic resin is used.
A green laminate 3 with a copper foil 2a laminated on the surface thereof is sent into a heat curing furnace A' and heated, and the uncured synthetic resin impregnated into the resin-impregnated base material 1 is cured to form a single sheet. was manufacturing laminate 3 (product). At this time, when press rolls are placed in the heat curing furnace A' and pressure is applied to the raw laminate 3 from above and below, the uncured synthetic resin with low melt viscosity in the resin-impregnated base material 1 flows out, resulting in defective products. Therefore, a pressureless continuous manufacturing method has been adopted in which the laminate 3 is simply passed through a heat curing furnace A' without a pressurizing means. However, in such a conventional pressureless continuous manufacturing method, when the copper foil 2a is thin and stiff, a waving phenomenon occurs on the surface.

[Purpose of the invention]

The present invention was made in view of the above-mentioned technical background, and its purpose is to eliminate the waving phenomenon that conventionally occurs on the surface of laminates,
The aim is to improve the quality of products.

[Disclosure of the invention]

The heating curing furnace for the laminate of the present invention is used for lamination forming by passing a raw laminate 3 in which a metal foil 2 is laminated onto the surface of a resin-impregnated base material 1 impregnated with a thermosetting uncured synthetic resin. In the heating curing furnace, sizing rolls 4 having a clearance δ of the required thickness of the laminate 3 are arranged above and below the uncured portion A through which the uncured synthetic resin of the resin-impregnated base material 1 passes in an uncured state. By pressing the metal foil 2 with a sizing roll 4 in the uncured portion A, the waving phenomenon is prevented and the metal foil is not damaged. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The resin-impregnated base material 1 is a base material such as paper impregnated with a thermosetting uncured synthetic resin such as unsaturated polyester, and the sheet-like material is heated in a heat curing furnace A.
are being sent continuously. A pair of laminating rollers 6 are disposed in front of the entrance 5 of the heating curing furnace A, and a plurality of resin-impregnated base materials 1 are laminated here.
and metal foils 2 with good conductivity such as copper foil are laminated on both sides to form a raw laminate 3, and the raw laminate 3 is fed into the heat curing furnace A from the entrance 5. The raw laminate 3 is heated by an internal heat source (not shown) while passing through the heat curing furnace A, and the thermosetting uncured synthetic resin impregnated into the resin-impregnated base material 1 gradually hardens. The product is allowed to progress, integrated with the metal foil 2, hardened, and turned into a product laminate 3, which is sent out from the outlet 7. Here, inside the heating curing furnace A, the uncured thermosetting synthetic resin is divided into an uncured part (a) where the curing reaction has not yet proceeded, and a semi-cured part (b) where the curing reaction is in progress, where the curing reaction has been completed. The completely cured part C can be divided into two parts, and these are approximately 1:
It has a length ratio of 2:1. In the present invention, a pair of upper and lower sizing rolls 4 is provided in this uncured portion A, and a clearance δ of the required thickness of the laminate 3 is formed between the upper and lower sizing rolls 4. That is, the clearance δ between the upper and lower sizing rolls 4 is
The thickness of the laminate 3 is slightly smaller than the thickness of the resin. No pressure is applied that would squeeze out the uncured synthetic resin impregnated into the impregnated base material 1.
Therefore, the raw laminate 3 before curing can be passed between the sizing rolls 4 in the uncured portion A to eliminate the waving phenomenon on the surface. Furthermore, since the resin-impregnated base material 1 is passed through the sizing roll 4 before it is hardened, the metal foil 2 will not be damaged even if the thickness of the metal foil 2 is extremely thin.

[Examples and comparative examples]

The following Table 1 shows the laminates (Example) manufactured using the above heat curing furnace, Comparative Examples 1 and 2 in which the same sizing rolls were provided in the semi-cured part and the fully cured part, or no sizing rolls. The quality of the laminate produced according to Comparative Example 4 without rolls is shown. As described above, it has been shown that according to the present invention, it is possible to extremely reduce the surface waving phenomenon, and also to produce a high quality laminate without causing scratches on the metal foil.

【table】

【Effect of the invention】

Since the present invention is constructed as described above, the surface of the impregnated resin impregnated into the resin-impregnated base material is smoothed by a sizing roll at an uncured stage, eliminating the waving phenomenon that has conventionally occurred. In addition, even when the metal foil is extremely thin, there is an advantage that the metal foil will not be damaged even if it is pressurized by a sizing roll.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a conventional example, in which 1 is a resin-impregnated base material, 2 is a metal foil, 3 is a laminate, 4 is a sizing roll, A is an uncured part, and δ is a clearance.

Claims (1)

[Claims] 1 In a heat curing furnace for lamination molding by passing a green laminate in which metal foil is laminated on the surface of a resin-impregnated base material impregnated with a thermosetting uncured synthetic resin, the uncured resin-impregnated base material is A heating curing furnace for laminated plates, characterized in that sizing rolls having a clearance for the required thickness of the laminated plate are disposed above and below an uncured part through which the cured synthetic resin passes in an uncured state.